Question

Calculati perimetrul unui dreptunghi ce are dimensiunile(lungimea si latimea)egale cu:
a)L=15dm ; l=6dm
b)L=20m ; l=30dm
c)L=2hm ; l=15dam
d)L=3,5dm ; l=1,8dm

Answer 1

P dreptunghi = 2(L+l)
a) P=42dm=420cm
b) P=100dm=1000cm
c)P=70dam
d)P=10.6dm

Answer 2

a ) P = 15+6+15+6     P = 42 dm

b ) P = 20 * 10+30+20 * 10 +30        P = 460 dm

c ) P = 2 * 10 + 15 + 2 * 10 + 15        P = 70 dam

d ) P = 3.5 + 1.8 + 3.5 +1.8        P = 10.6 dm